| Spscifications | HT56 | HT56PRO | |
| Combustible gas detection | 50~1000ppm | ||
| Range | 50~1000ppm | ||
| Detecting Gas | Combustible gas | ||
| Accuracy | ±30% | ≤10% FS(methane) | |
| Display | LED | LED | |
| Sensitivity≤10% FS(methane) | ＜50ppm (methane) | ||
| Response Time | ＜2 sec | ||
| Warm-Up Time | Approx.30 sec | ||
| Alarm Mode | Visible,audible | ||
| Auto Zero | √ | ||
| Auto Power Off | √ | √ | |
| Low Battery Indication | √ | √ | |
| Two-colour backlight | √ | ||
| Buzzer Alert | √ | ||
| Power | 2x1.5V AAA batteries | 2x1.5V AAA batteries | |
| Weight | Approx.35g | Approx.46g | |
| Size | 170X23X28mm | 180X32X31mm | |
| QTY | 200pcs | 80pcs | |
| Safety Rating | EN61326-1 | EN61326-1 |
